Circadian RhythmSuprachiasmatic NucleusPeriod Circadian ProteinsCircadian ClocksCLOCK ProteinsBiological ClocksPhotoperiodChronobiology DisordersARNTL Transcription FactorsPineal GlandSleep Disorders, Circadian RhythmCircadian Rhythm Signaling Peptides and ProteinsDarknessArylalkylamine N-AcetyltransferaseMelatoninLightCryptochromesBody TemperaturePeriodicityMotor ActivityActivity CyclesJet Lag SyndromeMesocricetusFeeding BehaviorSleepReceptors, Vasoactive Intestinal Peptide, Type IIBehavior, AnimalTime FactorsVasoactive Intestinal PeptideGene Expression RegulationNuclear Receptor Subfamily 1, Group D, Member 1Drosophila ProteinsPhototherapyRNA, MessengerCasein Kinase IepsilonNuclear ProteinsNeuronsMice, Inbred C57BLChronotherapyChronobiology PhenomenaLightingAlpha RhythmAtrial FibrillationTranscription FactorsCricetinaeWakefulnessFlavoproteinsHydrocortisoneRats, WistarRetinaHeart RateDrug ChronotherapyLiverOscillometryReceptors, MelatoninCorticosteroneSeasonal Affective DisorderElectric CountershockRod OpsinsWork Schedule ToleranceNuclear Receptor Subfamily 1, Group F, Member 1ElectrocardiographyLight Signal TransductionDorsomedial Hypothalamic NucleusSleep DeprivationTelemetryFeedback, PhysiologicalPhotoreceptor Cells, InvertebrateEatingSynechococcusBasic Helix-Loop-Helix Transcription FactorsSalivaOcular Physiological PhenomenaModels, BiologicalActivities of Daily LivingDyssomniasLocomotionNeuropeptidesSleep StagesAnti-Arrhythmia AgentsElectroencephalographyBeta RhythmLuciferasesGanglionectomyCasein Kinase IdeltaNeurospora crassaAnalysis of VarianceBody Temperature RegulationPhodopus